Loop aerial



P. D. MORRIS LOOP AERIAL Filed Dec. 5, 1927 m M m N I 79904. D. MafiR/sA TTORNE Y.

Patented Oct. 23, 1928.

UNITED STATES PAUL D. MORRIS, OF BERLIN, MARYLAND.

LOO]? AERIAL.

Application filed December 3, 192 7. Serial No. 237,545.

This invention relates generally to radio aerials, but more particularlyto those of the coil or loop type.

One object of this invention is to provide an efficient non-directionalaerial which is of sturdy construction and compact form, and which'maybe used out of doors and not be affected by, a variance in climaticconditions or storms.

Another object concerns the provision of an aerial which is of simpleconstruction and which may be easily and cheaply manufactured andassembled and readily restrung.

With these and other objects in view. this invention consists in certainnovel details of construction, combination and arrangement of parts tobe more particularly hereinafter set forth and claimed. I Briefly statedthis invention comprises an aerial composed of continuous coils of wiresuitably spaced and wound on insulators projecting from a frame, theframe being composed of bowed members rigidly braced by said insulators.

Referring more particularly to the accompanying drawings in whichcorresponding parts are indicated by similar reference characters: I

Figure 1 represents a front elevation showing the assembled aerial.

Figure 2 is a left side elevation of the assembled aerial showing onlythat portion of the conductors seen on the left side of the frame inFig. 1.

Figure 3 is a right side elevation of the a sembled aerial showing onlythat portion of the conductors shown on the right side of the frame inFig. 1.

Figure 4 shows a fragmentary portion of one of the insulators.

Familiar types of loop or coil aerials are usually of extremely delicateconstruction since they are designed principally for indoor use. Many ofthe folding type having exceedingly light frames on which the conductorcoils are wound. Those which are built for outdoor use are usually ofawkward con struction and inefficiently wound for nondirectionalreception.

It is thereforethe aim and purpose of this invention to provide a coilaerial designed primarily for outdoor use and which is of entremelysturdy construction, yet compact 1n form, and strung or wound in amanner to adapt it for the most efficient reception of terminals 22similar to radio frequency oscillations regardless of the direction oftheir point of emanation.

In describing the details of construction which have been adapted forthe purpose of lllustration the frame will be first considered.Referring to Figure 1, the numeral 10 designates a stanchion which issplit and bowed in- Wardly at its upper portion, as shown more clearlyat 11 and 12 in Figures 2 and 3.

The lower or undivided portion 10 of this stanchion 10 is of sufficientlength to permit the same to be fastened to any available gable,chimney, or roof cornice. The bowed members 11 and 12 of the stanchion10 are connected and rigidly braced by the rods 13 F lgure i), composedof insulating material, and which are fitted into holes drilled opposite to each other in the concaved bows.

The tie rods 13 are formed with a shoulder i l at each end, the purposesof which is to abut the opposite bows to assure their proper separation.The portion of the tie rod which is of smallerdiameter, as shown at 15is preferably threaded for the reception of internally threadedinsulator terminals 16 which are screwed thereon and which serve toprevent the bowed members from spreading as well as to serve as guidesfor the conductor windings.

The insulator terminals 16 are preferably cylindrical in form having acentral annular groove therein, as shown at 17. and which is ofsufficient width and depth to accommodate the conductor.

Centrally located between the bowed support members 11 and 12 areanother pair of support members 19 and 20 which are also bowed inwardlytoward each other and braced by the tie rods similar to 13, havingscrewed terminals 16 described above.

The inner pair of support members 19 and 20 are located concentricallywith and at right angles to the outer support members 11 and Theconstruction described gives a cross frame having projecting terminalsfor the support of the conductor windings which for convenience ofillustration will be started on the rear of the frame as shown in Figure1, altho either side would be suitable. Starting from the rear side atthe terminal 30 diagonally to the opposite side of the frame and thenmakes a complete revolution on the terminals 31, 32, 33 and 30, whichare directly opposite terminals 31, 32, 33 and. 30 being connected atopposite ends of the tie rods 13. On reaching the terminal 30 theconductor is strung diagonally across the frame to terminal 41 which isone of the next group of four terminals, namely 41,42,43 and 40,adjacent tothose on which the conductor has already been wrapped. Fromthe terminal 41 the conductor is brought to terminals 42, 43 and 40whence it again crosses the frame diagonally to terminals All and fromthere it is looped about 42, 43 and 40. On reaching terminal 40 theconductor is again strung diagonally across the frame to terminal 51,and so on the conductor is wound about groups of terminals first on oneside of the frame and then on the other until the desired number ofcoils for proper reception is reached. The unwrapped end 56 of theconductor is connected to the aerial terminal of a receiving set.

Besides use as the ordinary antenna which acts primarily as anelectrical condenser, the absorptive power of which depends on itscapacity,the improved aerial may be also used as a loop antenna whichacts primarily as an electrical inductance. The preference in use beingaccomplished by connecting either one end or both of the coil windingsto the antenna terminal or to the loop terminals of the receiver,depending on whether said receiver be the type adapted for antenna orloop reception.

In the aerial just described it will be noted that successive coils areplaced in planes parallel to but spaced at increasing distances from thecentral axis, and that after each revolution of the conductor it passesfrom one side of the loop to the other thus arranging a series of crosswires in planes diagonal to those of the loops, distributing theconductor leads in several places, and thus increasing the ability ofthe aerial to pick up the oncoming waves.

This improved aerial not only provides a frame of exceedingly sturdyconstruction, but one in which the distribution of the leads provides amore etlicient detector.

Altho in the foregoing, certain elements have been described as bestadapted to perform the functions allotted them, nevertheless it is to beunderstood that various minor changes may be resorted to within thescope of the appended claims without departing from or sacrificing anyof the principles of the invention.

Having described this invention, what is claimed as new and is desiredto secure by Letters Patent is 1. In an aerial, a frame comprisingadjacent inwardly bowed cross members, insulatorsv carried by said crossmembers and projecting from either side thereof, and a conductorsupported by said insulators and arranged in a plurality of continuousloops wound alternately on either side of said cross members.

2. In an aerial, a frame, comprising adjacent inwardly bowed crossmembers arranged concentrically and at right angles to each other, and aconductor supported by said cross members and arranged in a plurality ofcontinuous loops wound alternately on either side thereof.

3. In an aerial, a frame comprising adjacent inwardly bowed crossmembers, arranged coneentrically at right angles to each other, meanscomprising insulated tie rods for bracing said cross members, andadditional means comprising insulated terminals attached to the ends ofsaid tie rods for sup porting a conductor wound on said terminals in aseries of continuous coils alternately on either side of said frame.

t. In an aerial, a frame comprising a stanchion inwardly bowed at itsupper end, and a second inwardly bowed supporting member .iounted atright angles within the bowed portion of said stanchion, and concentricwith the bowed portion thereof, and a conductor supported by saidinwardly bowed members and arranged in a plurality of continuous coilswound alternately on either side thereof.

5. In an aerial, a frame comprising a stanchion inwardly bowed at itsupper end, and a second inwardly bowed supporting member mounted atright angles within the bowed portion of said stanchion, and concentricwith the bowed portion thereof, tie rods bracing said bowed members anda conductor sup ported by said inwardly bowed members and arranged in aplurality of continuous coils wound alternately on either side thereof.

6. In an aerial, a frame comprising a stanchion inwardly bowed at itsupper end, and a second inwardly bowed supporting member mounted atrightangles within the bowed portion of said stanchion, and concentrictherewith, tie rot s bracing said bowed members, insulator terminalsmounted at either end of said tie rods, and a conductor supported onsaid insulator terminals and arranged in a plurality of continuous coilswound alternately on either side thereof.

7. In an aerial, a frame comprising a stanchion inwardly bowed at itsupper end, and a second inwardly bowed supporting member mounted atright angles within the bowed portion of said stanchion and concentrictherewith, insulated tie rods bracing said bowed members, insulatorterminals mounted at each end of said tie rods, and projecting outwardlyfrom said bowed members, and a conductor supported on said insulator terminals and a ranged in a plurality of continuous coils wound alternatelyon either side of said frame.

8. In an aerial, a frame comprising a stanand arranged in a series ofcontinuously 10 wound loops of increasing circumference, the conductorpassing alternately from one side of the frame to the other at thecompletion of each loop.

In testimony whereof I have aflixed my 15 signature.

PAUL D. MORRIS.

